https://git.ruby-lang.org/ruby.git/commit/?id=8da7f4abc7

From 8da7f4abc779c6549833d718336d75aac98494b8 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 4 Jan 2021 15:50:30 +0900
Subject: [DOC] Update Proc.new without a block [ci skip]

[Feature #10499]
[Feature #15554]

diff --git a/proc.c b/proc.c
index 8a0a0c0..d087004 100644
--- a/proc.c
+++ b/proc.c
@@ -799,18 +799,15 @@ proc_new(VALUE klass, int8_t is_lambda, int8_t kernel) https://github.com/ruby/ruby/blob/trunk/proc.c#L799
 /*
  *  call-seq:
  *     Proc.new {|...| block } -> a_proc
- *     Proc.new                -> a_proc
  *
- *  Creates a new Proc object, bound to the current context. Proc::new
- *  may be called without a block only within a method with an
- *  attached block, in which case that block is converted to the Proc
- *  object.
+ *  Creates a new Proc object, bound to the current context.
  *
- *     def proc_from
- *       Proc.new
- *     end
- *     proc = proc_from { "hello" }
+ *     proc = Proc.new { "hello" }
  *     proc.call   #=> "hello"
+ *
+ *  Raises ArgumentError if called without a block.
+ *
+ *     Proc.new    #=> ArgumentError
  */
 
 static VALUE
-- 
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